Post you're bunk beds!

I'm going to be building QUEEN over QUEEN bunk beds in the back of our cargo conversion. I'm undecided if I should build them out of wood or metal. I'm also considering e-tracks with some 2x4, which seems it might be a good option.
The walls of the cargo trailer are 1x1 tubing (not sure on the material thickness, covered in 3/8th inch plywood.
I would love to see what you guys are doing for bunk beds, especially if they are queens or kings...
Here's the layout I have planned. If you have any suggestions on the design, I would like to hear them as well!
The walls of the cargo trailer are 1x1 tubing (not sure on the material thickness, covered in 3/8th inch plywood.
I would love to see what you guys are doing for bunk beds, especially if they are queens or kings...
Here's the layout I have planned. If you have any suggestions on the design, I would like to hear them as well!